Transmission locking device



0st. 2, 1928. l 1,686,047

P. L.. TENNEY TRANSMISSION LOCKING DEYIE Filed Aug. 2, 1926 2sheets-sheet 1 72 .7

3mm/Mofo OM ZW Stro: auf

oct. 2, 192s. y 1,686,047

P. L. 'I'ENNEYl TRANSMI S S`I 0Nl LOCKING DEVICE Filed Aug. 2. 192e 2sheets-sneer' 2 74 7a ze '74 96 ad O Q 66 6 a O w G C) /ao O /02 `-//4 O,4 O t o O i v /Gfffp 5 gwwro Patented oa. 2, ieas.

Uhlllwf'l SPTES PERRY ,inesatta nA'rIoN, on DETROIT, Mioniefnm Aooniionn'rfon or nnnnwnnn.

TRANSMSSION LOCKING Dnvfon;

original application iiiea May 7, 192s, seiiai No. 637,230.- Dividea andthis application nieayaugut 2,

1926. Serial No. 126,658.

This invention relates to transmissions and is illustrated as embodiedin the gear shifting mechanism of a transmission for an automobile. Anobject of the inventionis to provide inexpensive and readily assembledgear Vshifting devices which operate positively and a compactarrangement ofthe braking mechvided with openingawhich registers with anhorizontal port-ion.

anism. l

One important feature of the invention relates to providing gearshifting devices'which can be stamped or bent from heavy sheet metalwith a minimum ofv machining, by `arranging the sliding gears to beoperated by shifter forks, each of which has a vertical operatingportion and a slidably supported In'. `one' desirable 'arrangement thehorizontal portions are supported by a plate which is attached to thetop of the transmission casing along its edges and which may have anopening suitably formed to permit passage of the vertical portionsv ofthe shifter forks. v

Another feature of the invention relates to an improved interlockingdevice which is posi itively operated and which, while not necessarilylimited to such use, is especially well adapted to cooperate with theabove described slidably supported shifter forlrs. In

the *preferredI form, this interlocking device comprises a member whichis movedtransversely by transverse movementpof the gear shi-ftino leverand which has part-s operated by suc transverse' movement tol interlockwith the idle shifter forl positively to'` pre-,

vent itV from moving. In the illustrated einbodiment of the inventionthis member'is in theform of a slidable vplate having a slot embracingthe gear shifting lever, and whichA has a pair of down turned lugsonitslopposite sides so arranged that one of them is, moved by the leverinto a notch in' the outer,

edge of the idle shifter fork.

From a somewhat different point of view ythe invention contemplates'theprovision in a transmission of this type' of a simple but highlyeiiicient arrangement of transmission lock,

inic'ombination with the gear shifting devices,V

in` such a manner that one shifter fork `is locked directly while theother fork is locked indirectly through the medium` of an interlockingdevice such as the slidable plate `described above. the drawings one oftheshifter forks isprointhe arrangement Yshown inv opening in theinterlocking plate when the platevis in such a position as to loclrtheopposite shifter fork, anda key-controlled lock is L. TENNEY, yorr/ruNorn, INDIANA, As'sreNon To GENERAL nroffpns connoarranged so thatits bolt can be projected in`- to the registered openings tolock themechanism as described.

This application is a division of my applii cation for transmissions,Ser. No: 637,230,

filed May 7, 1923.` It is-intended to secure protection ontheassociation of the interlocking device and the transmission lock asdescribed in: the paragraph above.` c l Other `features of theinvention: relate "to a novel mounting for the gear shifting lever, i toa protection for the lock by enclosing it in av hardened steel sleeve,to aneflicient compactv arrangement of a transmission brake,y

and to other novel combinations of parts and desirable particularconstructions which-will be apparent from the following description ofthe illustrative embodimentof my invention shown in the .in which z *ivertical section andA partly insideelevation showing theA improved gearshifting and brake mechanisms in operative relation to the transmissiongears; y

Figure 2 is a section on Vthe line 2-2of Figure lushowing some ofv theparts'` of the gear shiftingniecl'ianism iii horizontal section. andotherpa'rtsi'n bottom plan; y v Q y f Figure 3k is a view partly in endelevation and partly `in transverse vertical g section showing theAarrangement of .the .key-controlled lock the transinissio'n` bral'e; andcFigure 4 vis an exploded perspective view showing some of'tl'ie' partsof the' gear shifting'meclianisin. f

Inl the form shown in transmission ifs enclosed in atransmissioncasingl() having'` a. cl'utchhousing 12 atone vend andin which'arearranged in the usual ranged coaxially ofa drive shaft lzthere beingvagear/18 on the driveshaft 1.6 meshin with algearn20 on a counteishaft22.k The accompanying drawings,`

Figurev l is la view'pa-rt'ly `in longitudinal the drawings the manneriasplined driven shaft 1% 1 which is ar-;

counter shaft is provided with gears24` and the'drive shafty 14 isprovided with 'a1 gear x26" which .is axially movable `toprovidei'ntermediatev and high' speeds andi with asecond near 28 which-i's-axially movable to provide owspeed andreverse.. 1

A:c'ording toA i the Vpresent invention niet gears 26 and 28 arecontrolled by shifter forks 30 and^32, the fork 30 having a verticallyextending portion 34 seated in an annular roove 36 formed on gear 28,while the shifterV ork 32 has a similar yverticall extending ortion 38which seats in an annu ar groove 40 1n a part of gear 26. Each of theforks also v has a horizontal portion which is slidably 52 :tri-gare i).

supported by `a supporting plate 442 which is turned upwardly at itsedges to provide flanges 44 attached to the top of the transmissioncasing in any suitable manner as by Vlneans of bolts or rivets 46. Thehorizontal portion Vof each of the shifterforks is provided with threeconical depressions 48 arranged to be engaged by the end of a, pin 50 yfrom the top of the transmission casing throughout yits central portionand this por- -tion is provided with an opening 54, which y"permitsmovement of the vertical portions 34 and 38 of the shifter forks.

The yhorizontal portions vof the shifter forks are provided with notches56 and `58 which .are 1n alinement with each other when the shifterforks are both in neutral posic'` tion, and whichy receive the lowerlrounded end of a vertically extending gear shifting lever 60 which issupported in such a manner ytli'atiit can be rocked'transversel ztlieylowerend from the one notch fvother, and which can be rockedlongitudinally to move into the to roperate either one of the shifterforks by Sliding its horizontal portion along'the central portion ofthesupporting plate 42. In order .to permit such movement of lever 60,it-

' carries a semi-,spherical sheet metal ball `member 62 which forms aball-and-socketvjoint with` a conical seat formed Ain a horizontal web64 lofan upwardly extending portion 66 of the cover of the transmissioncasing 10.

A Member 62 is held against its seat by a compression spring 68 coninedbetween the semispherical member 62 and a washer 70 slidably engagingthe lower surface of the top of a perforated cap 7 2, which issecured tothe top of portion'l66 by meansof screws 74 yor in any other suitablemanner.

Accordin'gto an important feature of the invention, there is arrangedbetween the horizontal portions of the shifter forks yand the lowersurface ofthe top of the transmission lcasing an interlocking plate 76shown in dot 1 and ydash lines in Figure 4 and in its assem- -bledrelation in theother views. lThisinterlocking plate has a longitudinallyextending vcentral slot 7 8 which embraces the lower end l of the gearshifting lever in such a manner that the plate` is moved transversely bytransverse .movementof the lever but is not affected by longitudinalmovement of the lever. The plate 76 is also provided with transverselyextending slots 79 for the passage of the spring pressed pins 50. Theopposite edges ofthe interlocking plate have down-turned lugs r80,

which pass through slots 82 formed in the flanges 44 of the supportingplate, and which are spaced from each other on opposite sides of theinterlocking plate 7 6 at such a distance that transverse movement oflever 60 operates lto move that one of the lugs 80 which is'on the sideof the interlocking plate toward which they lever 'is moving out of itsinterlocking notch 84 (one of which is formed in kthe outside edge ofthe horizontal portion of each of the shifter forks) while at the sametime the opposite lug 80 is moved into its notch 84 positively toprevent movement of `theidle shifter fork. By this arrangement when theleveris rocked transversely to move it from notch58 into notch 56 orvice versa, the active shifter fork will be unlocked by movement of thelever while the idle shifter fork will be positively locked byinterengagev v that, before the transmission can be locked, it

is necessary to rock the lever 60 to bring'its lower end into the notch58, thus moving the `interlocking plate 76 in such a manner as tointerlock with the shifter fork 30, and at the same time to register theopenings 92 and 94. Thus, after the lock has been manipulated to projectthe bolt downwardly, the shifter fork 32 is directly locked by the bolt,and the shifter fork 30 is indirectly locked by the bolt through themedium of the interlocking plate 76. v

At the end of the transmission casing opposite the clutch housing 12 abrake drum 100 is keyed to the driven shaft 14y and is surrounded by acontractable brake band 102 faced with friction material and havingbifurcated ends secured to .cross pins 104 and 106 carrier by bell cranklevers 108 pivoted at 100 on a bracket 112 secured to the transmissioncasing. The operating arms of the bell crank levers 108 extendtransversely beyond the drum 100 and are connected or bridged at theirouter ends by apart (which may be integral with the lever if desired)through which passes the lower end of an operating link 114 connected atits upper end to a rearwardly extending arm of a bell crank lever116,which may be the usual emert levers 108 are urged toward their upper oridle positions by a spring 118. Manipulation of the emergency brakelever 116 to rook the bell crank levers 108 in a clockwise directioncontracts the band 102 to exert a braking force on the shaft 14 t-hroughthe drum 100.

Vhile one illustrative embodiment of my invention has been described indetail it is not my intention to limit its scope to that embodiment orotherwise thanfby the terms of the appended claims.

I claim:

1. A transmission lock comprising, in combination, shifter forks, alever movable into a position to operate either fork, an inter.- lockingdevice positively operated by the lever to prevent movement of the idlefork, and a lock including a bolt movable into locking engagement Withthe interlocking device and one shifter fork.

'2. A transmission lock comprising, in combination, shifter forks, alever transversely movable to positions for operating either fork, aninterlocking device positively moved by the lever in itstransversemovement to prevent actuation of theidle fork, and a lock comprisingmeans to positively engage the interlocking device and the active forkWhen the lever has been transversely shifted.

3. A transmission lock comprising, in com bination, shifter forks, alever movable to positions for operating either fork, an interlockingdevice positively'moved by the lever, a reciprocating locking bolt, oneof said forks having an opening positioned to receive said locking bolt,the interlocking device having an opening registering With the forkopening When the lever is shifted to a position from Which it mayactuate the aforesaid fork.

4i. A transmission lock comprising, in combination., a pair of shifterforks, a gear shifting lever operating either of the forks, aninterlocking device operated by the lever to prevent movement of theidle fork, and a lock constructed and arranged to lock the fork Which isin active position directly and to lock the fork which lis inidleposition through the interlocking device.

5. A transmission lock comprising, in combination, a pair of shifterforks, a lever to operate either of the forks, a device operated by thelever to interlock with and preventl movement of the idle fork, and atransmission lock which locks the interlocking device and f thusprevents movement of the idle fork. y 6. A transmission lock comprising,in combination, a pair of shifter forks, an interlocking device whichprevents movement of the idle fork, one of the forks and said devicebeing provided vvith openings, and. a transmission lock having a boltarranged lto be projected through the openings to lock the one forkdirectly andto lock the other fork through the interlocking device. e 7.A transmission lock comprising, in combination, a pair of shifter forkshaving slidably supported horizontal portions With notches in theirouter edges, and one of Which horizontal portions is provided With anopening, a sliding interlocking plate having down turned lugs soarranged that one of them seats in the notch 'of the idle fork andhaving an opening which registers with the opening in the horizontalportion of the one fork When the other fork is locked, and atransmission lock having a bolt arranged to be projected through theregistered openings.

In testimony whereof I afiX my signature.

` PERRY L. TENNEY.

